Photochemistry of monolayer CH3i on Ag-covered TiO 2(110) surface

Chaochin Su, Chih Chieng Chen, Chih Song Tsai, Jong Liang Lin, Jiing Chyuan Lin

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The photochemistry of monolayer methyl iodide (CH3I) on a silver-covered TiO2(110) surface is studied by X-ray photoelectron spectroscopy (XPS). Upon the UV irradiation of CH3I/Ag/TiO 2(110) at a cryogenic temperature, methyl iodide undergoes desorption and dissociation. The cross sections for CH3I dissociation and desorption are measured at different photon wavelengths of 251, 290, 312, 364, 403, and 546nm. The photochemistry of monolayer CH3I on Ag/TiO2(110) is wavelength dependent. While photodissociation is the predominant mechanism for CH3I depletion upon irradiation with large-wavelength lights, the nonthermal photodesorption of molecular CH3I becomes the major process at wavelengths below 312 nm. The desorption of energetic CH3 fragments following CH3I photodissociation is evident. Possible mechanisms for the present photochemistry of CH3I on Ag/TiO 2(110) are discussed and compared with those on the Ag(111) and TiO2(110) surfaces.

Original languageEnglish
Pages (from-to)7845-7853
Number of pages9
JournalJapanese Journal of Applied Physics
Issue number10 A
Publication statusPublished - 2006 Oct 15

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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